-why are they useful? They aren't.
-what do you like about them? I can't really think of anything at the moment.
-what do they give you? Probably a small amount of fun, possibly some bragging rights, occasionally some sort of increase in your playing/levelmaking skill. And a clan tag.
-in what would you like to be(or in what are you)? CT
-Do you like being clanless? Yes.

(note: not intended as a troll post)